SSID not Disabled

The Disable SSID function doesn't seem to work whether I use the Linksys firmware or HyperWRT 2.0b4 firmware (which I am using because it finally allows me to use WPA-PSK, whereas the latest Linksys firmware never worked).

No matter whether I Enable or Disable the SSID broadcast, my Dlink connection software and NetStumbler show the SSID every time. What gives?